Siemens S7-400 Service Manual Page 210
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Programming Examples
Ladder Logic (LAD) for S7-300 and S7-400 Programming
B-10
A5E00706949-01
B.4 Example: Counter and Comparison Instructions
Storage Area with Counter and Comparator
The following figure shows a system with two conveyor belts and a temporary
storage area in between them. Conveyor belt 1 delivers packages to the storage
area. A photoelectric barrier at the end of conveyor belt 1 near the storage area
determines how many packages are delivered to the storage area. Conveyor belt 2
transports packages from the temporary storage area to a loading dock where
trucks take the packages away for delivery to customers. A photoelectric barrier at
the end of conveyor belt 2 near the storage area determines how many packages
leave the storage area to go to the loading dock. A display panel with five lamps
indicates the fill level of the temporary storage area.
Display Panel
Storage area
empty
(Q 12.0)
Storage area
not empty
(Q 12.1)
Storage area
50% full
(Q 15.2)
Storage area
90% full
(Q 15.3)
Storage area
Filled to capacity
(Q 15.4)
Temporary
storage area
for 100
packages
Packages in Packages out
Conveyor belt 2Conveyor belt 1
Photoelectric barrier 1 Photoelectric barrier 2
I 12.0 I 12.1
- 6ES7810-4CA08-8BW1 1
- Safety Guidelines 2
- Qualified Personnel 2
- Prescribed Usage 2
- Trademarks 2
- Disclaimer of Liability 2
- Preface 3
- Requirements 4
- Online Help 5
- Further Support 5
- Training Centers 5
- Technical Support 6
- Contents 7
- A5E00706949-01 10
- 1 Bit Logic Instructions 11
- 1.4 XOR Bit Exclusive OR 14
- 1.6 ---( ) Output Coil 16
- 1.8 ---( R ) Reset Coil 20
- 1.9 ---( S ) Set Coil 22
- Symbol 32
- 1.17 Immediate Read 33
- 1.18 Immediate Write 34
- Bit Logic Instructions 36
- 2 Comparison Instructions 37
- Symbols 38
- 2.4 CMP ? R Compare Real 42
- Comparison Instructions 44
- 3 Conversion Instructions 45
- 3.2 BCD_I BCD to Integer 46
- 3.3 I_BCD Integer to BCD 47
- 3.15 CEIL Ceiling 59
- 3.16 FLOOR Floor 60
- 4 Counter Instructions 61
- Counter Instructions 62
- 4.2 S_CUD Up-Down Counter 63
- 4.3 S_CU Up Counter 65
- 4.4 S_CD Down Counter 67
- <C no.> <Z no.> 70
- 5 Data Block Instructions 75
- Data Block Instructions 76
- 6 Logic Control Instructions 77
- 6.5 LABEL Label 81
- Logic Control Instructions 82
- 7 Integer Math Instructions 83
- Math Instructions 84
- 7.3 ADD_I Add Integer 85
- 7.4 SUB_I Subtract Integer 86
- 7.5 MUL_I Multiply Integer 87
- 7.6 DIV_I Divide Integer 88
- Integer Math Instructions 94
- Point Math Instructions 96
- 8.3 Basic Instructions 97
- Description 100
- Status word 100
- Example 100
- 8.4 Extended Instructions 103
- 9 Move Instructions 113
- Symbol 124
- SRCBLK RET_VAL 125
- 10.7 Call Multiple Instance 126
- 10.14 ---(RET) Return 134
- 11.1 Shift Instructions 135
- 11.2 Rotate Instructions 145
- Status Bit Instructions 152
- Examples 155
- Area in Memory 162
- Time Value 162
- Time Base 163
- Choosing the right Timer 164
- Timing Diagram 166
- 14.3 WOR_W (Word) OR Word 187
- Word Logic Instructions 192
- Mnemonics (International) 193
- Mnemonics (SIMATIC) 196
- B Programming Examples 201
- Clock Pulse Generator 206
- Signal Check 207
- Programming Examples 209
- Solving a Math Problem 213
- Ladder Logic Program 213
- Heating an Oven 214
- Programming Examples 216
- C Working with Ladder Logic 217
- end: AN error 218
- 5 NOP 0 222
- C.2 Parameter Transfer 223
- Working with Ladder Logic 224
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